<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1>跨域请求-代理</h1>
    <!-- 
        将我想请求的目标地址
        告诉代理服务器
        代理服务器再去请求目标地址
        代理服务器将目标地址的响应返回给我
     -->
    <script>
        function fn1(){
            const xhr = new XMLHttpRequest();
            xhr.open('GET', '/yanglu', true);
            xhr.onload = function(){
                const res = JSON.parse(xhr.responseText);
                console.log(res);
            }
            xhr.send();
        }

        function fn2(){
            const xhr = new XMLHttpRequest();
            xhr.open('GET', '/guanrui', true);
            xhr.onload = function(){
                const res = JSON.parse(xhr.responseText);
                console.log(res);
            }
            xhr.send();
        }

        function fn3(){
            const xhr = new XMLHttpRequest();
            xhr.open('GET', '/panpan', true);
            xhr.onload = function(){
                const res = JSON.parse(xhr.responseText);
                console.log(res);
            }
            xhr.send();
        }

        fn1()
        fn2()
        fn3()

    </script>
</body>
</html>